The lawsuit alleges that the pharmacy is responsible for medical negligence. Allen seeks compensation for physical pain and suffering, mental anguish and medical expenses among other damages.

When contacted late Tuesday, a person who answered the phone at Cullen Care Pharmacy's Cullen Boulevard location said that no one was available for comment on the lawsuit.

Jadalyn was diagnosed with sickle cell as a 1-year-old. She was under the care of a physician in the hematology department of Texas Children's Hospital and had been prescribed morphine over the previous five years "whenever she had these flare-ups," Aziz said.

The family's lawyer said he had been attempting to settle with the pharmacy's insurance company, but "negotiations broke down."